There are many reasons why artists choose to collaborate: from simply being mates who want to work together right through to carefully calculated record label-enforced hookups with the aim of broadening their fanbase.

Following the recent unveiling of Professor Green's new single featuring indie rocker Miles Kane, we've listed our 13 favourite unexpected collaborations. As you can imagine, the results vary from the unexpectedly brilliant to the downright bizarre...

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Snoop Lion and Miley Cyrus: 'Ashtrays and Heartbreaks'
With both performers currently undergoing a major image revamp, we can understand why the former Disney princess agreed to appear on Lion's reggae-themed album. The results, however, are as strange as you'd expect.

Flaming Lips and Ke$ha: 'You Must Be Upgraded'
Ke$ha has made no secret about her love for Flaming Lips, but we didn't actually expect the pair to record music together as they did last year on 'You Must Be Upgraded'. What's more, they apparently enjoyed each other's company so much they've recorded a full album appropriately titled Lip$ha, which will follow later this year.

Alicia Keys and Jack White: 'Another Way to Die'
This unlikely collaboration was used as the theme for the 2008 James Bond film Quantum of Solace. Much like the movie, this was far from their best work.

will.i.am, Jennifer Lopez and Mick Jagger: 'T.H.E.'
A collaboration as bizarre on paper as it is in practice. We suspect will.i.am felt the same way, given that it failed to make the cut on his latest album #willpower. While the Mick Jagger finale isn't bad, it's hard to condone a song that includes the line: "I'm-a work hard, that's my thesis/ This beat is the s**t, faeces."

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Nelly and Tim McGraw: 'Over and Over'
In a bid seemingly to show us his softer side, Nelly collaborated with country singer and actor Tim McGraw on 2004's 'Over and Over'. The result wasn't a complete disaster either, topping the UK charts and reaching the top ten in 11 other countries.

Madonna and Lil Wayne: 'Revolver'
In some ways, this collaboration makes complete sense: Lil Wayne loves to rap about lady parts and Madonna enjoys flashing hers. However, the track itself - which featured on her 2009 Celebration album - is just plain weird.

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Paul McCartney and Michael Jackson: 'Say Say Say'
The former Beatle teamed up with Michael Jackson on this 1983 track, which became a hit across the globe. And if the collaboration didn't seem unusual enough, the music video - which sees Jackson hitting on his sister LaToya - more than makes up for it.

5ive and Queen: 'We Will Rock You'
It made perfect sense at the time: 5ive were the UK's biggest boyband and Queen have put their name to a lot worse, but in hindsight, we can't believe this actually happened.

David Bowie and Mick Jagger: 'Dancing in the Street'
Bowie and Jagger hooked up in 1985 for what in theory should have been the ultimate collaboration. The result may not have lived up to expectations, but it remains comedy gold.

Bone Thugs-N-Harmony ft. Phil Collins: 'Home'
The US hip-hop group recorded 'Home' with Collins in 2003, and the results weren't as disastrous as you'd expect.

Kanye West and Justin Vernon (of Bon Iver): 'Lost in the World'
Of all the guest features on Kanye's My Beautiful Dark Twisted Fantasy album, hooking up with Bon Iver's Justin Vernon was one of the most surprising but also one of the best.

Norah Jones and Dave Grohl: 'Virginia Moon'
Jones teamed up with the Foo Fighters frontman for her 2010 ...Featuring album, giving a neo-soul reworking to the band's track from their 2005 album In Your Honour. Unbelievably, her soothing tones suit the track rather well.

Which are your favourite musical collaborations? Leave your comments in the box below: